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28069 高温CAN通讯问题



DSP28069PZT在60多温度时会通讯报警,80多度时候CAN通讯无法接收,dsp芯片在工作,在温度低于60度时恢复正常通讯。排除收发芯片的问题,已将收发芯片与DSP分装两块PCB板,收发器温度在120度工作正常。求有没有遇到相似问题的大侠和TI高级狮狮解答!!!急!!!!!